Premises and Equipment - Schedule of Premises and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 62.8	$ 63.4
Less accumulated depreciation and amortization	(51.8)	(50.3)
Premises and equipment, net	11.0	13.1
Computer Hardware
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	23.2	22.6
Operating Lease ROU Assets
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	16.3	17.2
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	5.8	6.1
Computer Software
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	15.0	15.0
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 2.5	$ 2.5

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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